Is that possible to make a login system similiar with this. I want to make 2 types of account:
-Guest Account (like GrowID= Guest Password= Guest)
-Developers
If it's possible, how? I didn't hear it's possible to make textbot on to the scene.
What you're asking is quite vague. Are you asking how to do "guest" and "developer" validation? Or are you asking how to have more than one input boxe? Or both?
To answer input boxes: depends on what you're doing/using for your text-boxes. If it's a well-supported gui library you're using there shouldn't be any problems with having more than 1 text box and retrieving its values. Otherwise you'd have to find another library yourself, or someone here could help you find a solution.
To answer validation: This takes some time to implement with or without adding security. Even without adding some extra security to the process it can be slightly tricky to add this in, but by making it more secure, you'll have a fun time realizing it's next to impractical/impossible to fully prevent (especially if you're using a module that makes it trivial to decipher source code).
The number one rule in making multiplayer games is, "don't trust the client." So whatever you need to do that's important, do it serverside. A simple yes-no check at the login isn't a valid approach. If someone is sending dev-like commands to the server and your server wasn't the one to validate being a dev then it'd be incredibly easy to spoof.
Otherwise, to make it as simple as possible, just ignore that the player might be malicious and use the most straightforward approach you can.
client: sends - name, password
server: checks it against your favorite data-base of usernames and encrypted passwords. If it is a guest account, do simple verification. If it's a real account, logout(if logged in)/login and verify. If dev account do the same as a real account accept add somewhere on the client or server(preferably) you're a dev.