I'll pop the pictures here. Remember you need to use your "Active Key" when converting.
When you left click on the money amount the above is what you get, click on "Convert to Steem"
Then you get this :

Then you get the convert to steem:

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Enter the mount you want to convert then click convert. It will pop another window up for you to enter your Active Key in. Then in 3.5 days you will see almost the amount in your "Steem" tab increase. Then you do the same thing in the Steem Tab, and pick Power up. No waiting on the power up part, but you will need you "Active Key" once again to finish the power up.

I hope that I did not confuse you to much.