Roblox is located at www.roblox.com and it won't move from that address. The only other official addresses that ROBLOX uses are the test servers, at gametest[1-5].robloxlabs.com and sitetest[1-5].robloxlabs.com, as well as some other subdomains that are more rarely seen, but that all end with ".roblox.com". You should not enter your password on any website, unless its URL ends with ".roblox.com" or ".robloxlabs.com".
Clicking the big 'ROBLOX' at the top of your screen will always take you to the home page.
This is the big text menu at the top of your screen all the time. No matter where you are on the main website (www.roblox.com) you will see this bar and can use it to get around the website.
Click on something in the picture to learn about it!
Note: The theme shown is the normal theme, the current theme may vary in color or style.
In the top left corner of the menu bar you can see your username. Make sure it's you, and not your friend who forgot to log out! If a username isn't shown and it's just Login, then you need to log in!
Note: When playing ROBLOX at school, be careful. This article teaches you some precautions you should always take when playing ROBLOX at school.
If you click Login you will be shown the Login box. All you do is type in your username and password, just like on any online site. Alternatively, if you have connected your account to Facebook, then you can hit the Sign in with Facebook button.
This button does exactly what it says, it will log you off of Roblox.
If you are over at a friend's house, or if you have any sister or brother, it is a really good idea to log out when you finish playing on Roblox. If you log out other people can't get on your account and mess with your stuff. Remember to log out to prevent your stuff from being accidentally deleted.
For tutorials about the website, see this page.