i dont want users add space between two words and use it as nickname. And also they use eamils as nicknames. How can i fix this. thank you.
Well, the spaces inside the user name are allowed (but not at the start and at the end). Fixing it will need changes to the engine code. But I don't want to make this restriction, simply because can't see what is the problem with such names??? Let your users use whatever they want. It is harmless or even good for the forum community.
The login with the email also needs changes, but is actually reasonable feature. I will include it in the to-do list and will implement it at the first chance.
But notice (if you have such expectations) that this feature, does not actually increase the accounts security level.