Edit Merchant
About
Merchants can be used on Expenses & Subscriptions. They help separate the data so you can see how much your expenses are for going out ETC...
Video
Tutorial
The first step to create a merchant is to go to the Merchants on the Dashboard:

Now you will need to click on the merchant that you're wanting to edit.

Click on the Edit Merchant button under Actions Box.

You will fill the Name & About fields in then click the Save button.

You have now updated a merchant to be used in expense or subscription.