If you don't know, see under how to do.
This page indicates you how to enter the virtual world indicated in the link you clicked on.
If you never did that, please read all what follows.
Computer:In theory, any can be used, under Windows, Mac ou Linux. In practice, you need a computer with a minimum of graphic card. Cheap computers and most laptops wil show jerky movements and bad images, for a frustrating experience. Tablets and cellphones cannot be used. More info here
screen prefer a large one. Today (2019) there is no 3D helmet really usable with one of the indicated viewers:
Install a viewer:
For links pointing toward VRML scenes, the legacy web browser extension Cortona can still be installed here: Cortona (Totally unrelated to Cortana).
Start with creating a character
For this, click here: Login URL (Some pages need to click on «create account» or other riddles). You get a form which allows you to choose a starting appearence (that you can change later), more a character name, and a password that you will have to use in the viewer. An email is requested, for confirmation, and to receive infos.
Then start the viewer
Your cursor is in a field at the bottom, where you enter your character name, then besides your password. (it is recommended to uncheck «Remember Username», especially if you share your computer.). For beginners, it is better to leave the third field on «Home»
Under the previous is a field called «Grid:». Search for «Discovery Grid». If you find it, select it, and you just have to click «Log In» to enter!
If «Discovery Grid» is not in the list, then go in menu «viewer» at top left, then «Preferences», then «OpenSim». Find the field «Add new grid», and copy paste in the Grid URI which follow: «http://discoverygrid.net:8002/». Click «Apply» then «OK»: Discovery Grid was added to the list! You can now connect as above.
The indispensable bases are:
Walk, with the arrow keys
Fly, with the PgUp and PgDown keys
Speak, first in text, with the menu «conversations» at bottom left. It opens a window which also show the private chat (very useful if you did a blunder)
explore, with the menu «Map» at bottom right. Today virtual worlds are very big, making their population sparse. You can teleport with clicking on the map, or remember places you like with the menu at top left: «World» then «Landmark this place».
There are many other things to learn, but it is enough of a few every day. Never hesitate in asking for help to people you meet: You will get a new thing every day.
There are many interesting things to do in the virtual, either for oneself or with others. Have your project, whatever it is, meet like-minded people, and learn more to lead your project to success.
The media often despise virtual worlds are ruleless and lawless. Gross mistake: the people you encounter are real persons, with their sensitivity and their limits, often from countries with a totally different culture. So respect and all the useful social rules also apply. Sometimes, people do not reply you: they can be busy, or simply not see your text. So it is better to behave in a mature and constructive way. Troublesome people and wackos are quickly spotted and banned.
Last warning, The people you see may look sexy, but this does not mean they are sexually available (In more many do not display their real gender, so beware of surprises).
Have success in your new virtual life!