In order to make profit on the LUNA you are holding (on top of the growth of the currency), you'll need an anchor account - go to the Anchor app and connect your terra station wallet (you'll need the chrome plugin I think).

Next you'll need to convert your LUNA into "bonded LUNA":

1. Go to the bAsset page
2. Click on the LUNA / bLUNA box, and then "mint & burn"
   
3. Enter all of your LUNA (hit max)

Now that you've converted your LUNA into bLUNA, you can borrow against this amount.

1. Click on the "borrow" tab
2. Click on "borrow"
3. Select an amount less than 75% (I suggest 65% - 70%)
4. Select proceed.

Now you have borrowed UST against your LUNA collateral. The next step is to lend the UST back for a yield (currently 19.5%):

1. Click on the "earn" tab
2. Click on "deposit"
3. Enter most of your UST (you will need to leave $5 or so in your account to cover future transactions)
4. Click on proceed.

You're all set. Now you will earn money every time the LUNA price increases AND make money on lending the UST you borrowed. You wise person!