How can i upload my apk on google play?


this is the error that’s giving me i know how to upload and publish games on google play i have doing it for
a long time,but this few days it’s giving me this error why? can u help me

Read it. All of it.

In a nutshell, sign your app. Do not attempt to jump straight to that. Read the page. You likely missed a tiny step. Annoying? Yes.

Not yet valid suggests that a timestamp has not occurred yet or you have not properly registered the Key.