Can't Activate with my Apple ID

hi..Apple,i got a big problem.plz help me..i creat apple ID first. And creat a icloud mail.. password are not the same.. i think, i make a some mistack.Now i can't open my ipad. (Activate ipad. This iPad is currently Linked to an Apple ID (n....@icloud.com). Sign in with the apple ID that was used to set up this iPad). I already have My Apple ID and password but i don't remember my icloud password .....i try with my apple ID and password but i can't Activate My iPad... How can i Activate. Thanks

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