I am unable to open I cloud with my apple I'd every time I try message comes that " max no of account have been activated on your I pad"  what needs to be done,how can I delete the accounts which I had opened as I don't remember the I'd and passwords

Can any one help me on this

It seems that you've been trying to create Apple IDs (even if you thought you were just trying to use one to make an iCloud account) and you have reached the max allowed number of IDs you can create on the device (which is 4 or 5 as I recall). The only way to create yet another one is to use a different device or a computer. No other way around this.
If on the other hand you want to USE an existing one, go to Settings>iCloud and enter that ID. 

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