Activation lock

I’m looking help about activation lock.

My my sister has reset her iPad and we can’t remember her password and on the screen there is no option given of forgotten password to get another way into the iPad.

Does anyone know what I can do to get signed back into the iPad even if I can and where I could go to change her password?

ANY help would be greatly appreciated!

*this is what is on the screen at the minute and we can’t get passed this stage of log in*