I can`t continue to my wordpress dashboard

ive done changing password and nothing change.wen i enter my log-in info its affair blank page.

at that time i was exploring to my cpanel and when i signed in to my wordpress it just happened, i can `t signed and wen i deleting cokies They show up the information logged.but to dashboard not showing it has blank pages.

I appreciate your help.

i will try this and follow instructions. thanks a lot, i will message later if its ok and fix.