What if you can't sign in to league of legends?

Answer 1

2 reasons that may be the cause.

1. you may have registered on the wrong region, you cant play with a east account in the south region. check what region you choose in the launcher.

2. the servers may be offline, they sometimes shut down the server in order to fix something that's critical or they are moving servers.

Answer 2

You should try to check first if you are on the right server. In the case that it is the right server, try to check if your Caps Lock is on. If this didn't help, try to restart your computer. If this didn't help, you should contact the Riot support.

Answer 3

Check the league of legends web sites for your region and see if anyone else is having problems and go from there. If it isn't just you and it's a problem with riots servers then you should just wait it out. If Riots servers are not the cause of the problem you might want to do a system restart and check the league of legends forums to find someone else with the same issue you are having.