How can be fide titled online

Any way

By being better at chess.

Not like that fide tournaments online

you should have a certificate with a photo of you and if you want to be:
-CM 2200 FIDE
-FM 2300 FIDE
-IM 2400 FIDE with 3 norms
-GM 2500 FIDE with 3 norms as well
If you are

a girl it's too easy