How do I get my coins to stake? I've had coins in my wallet for over 3 weeks now. It occasionally shows I have anywhere from .2 to .7 staked, then it goes to 0 on its own again.

I have 3.1 total coins that have been in my wallet. I am getting random amount of coins everyday, but I would like to make sure my coins are officially "staked" incase a domain is sold and profits are issued.

Thanks,
-Brian