Here is one way. Probably the easiest.
https://steemit.com/blocktrades/@blocktrades/blocktrades-now-offering-steem-power-for-cryptocurrency
Another way is to purchase steem from an exchange (bittrex, binance, etc) and transfer it to your steem account.
The price of Steam is cheap right now. It might be a good time to consider buying this alt coin.
it's now in my wallet, what's next? not intuitive for someone with ADD. Thx
There should be a dropdown menu to click on in the wallet next to where it says steem. Click it and then select power up.