If you have any funds staked in the old staking, unstake them on the OLD page
To be eligible for any of the tiers you are required to stake the following:
You need to register for an IDO after you staked.
When IDO registration period starts (usually 24h before the IDO start), you need to open the Pools page and click the "Register" button in the pool card.
When you register for an IDO, your level is recorded (for this specific IDO). There's no way to change it to a higher level after registration. So make sure you are on the level you want before registering. You will be able to stake more and register for other IDOs with a higher level though.