You are not giving me any info.. I cannot really help you without knowing what you are talking about.
Do you have a time capsule?
If so please connect to it by ethernet.. and change the security settings and channels as I have said.
If you don't have a time capsule you are posting in the wrong area.
What device are you trying to connect to the Time Capsule?
If you type in the password and it is not accepted the setup is wrong.
Reset the TC to factory and start again.
Use name. TC
Use 2.4ghz name TC24ghz
Use separate 5ghz name TC5ghz
Set WPA2 Personal security.. use password 8-12 characters pure alphanumeric.
Use fixed channels.. either 1, 6, or 11. Try each in turn.
This is required to get iOS devices to work.. at times.. computers might work ok but you need the short, no spaces. pure alphanumeric names for some iOS.. and you need fixed channels..
BUT you haven't told me enough to do anything.