I dont understand how i can get my coins in use from watching only wallet??
You can't.
That's why it's called a
watching ONLY wallet.
If you could spend the coins out of it, then it would be called a "watching and spending" wallet, or a "full wallet", or perhaps just "a wallet".
PLEASE HELP!"!!
How did you set the wallet up? In order to set up a watching only wallet, typically you would set up a regular full wallet, and then add the addresses from the full wallet to your "watching only" wallet. That way you could keep your full wallet secure and offline where it couldn't get hacked, and still see the current balance in the "watching only" wallet.
If that's what you did, then you need to put your full wallet online and spend the bitcoins from there.