I paid for Supplies (or any other purchase) for the company using my own personal funds (or personal credit card). How do I get those expenses into my business books?

This is the two-step process:

1. Transfer $ from your business account to your personal account. Then when you see that cash OUTFLOW in Pocket, categorize the transaction to Supplies expense (or whatever account describes you paid for). If there were different categories of expense, then you can use the Split Payment button and categorize to multiple account categories.

   If you don’t want to take that money out of your business account, and instead you want to keep that cash in your business, then move onto step 2.

2. Transfer the same $ amount back from your personal account to your business account and categorize this cash INFLOW to the Loan Payable - Owner account or Owners Contribution/Distribution account, whichever is applicable. 

The net effect is that both your business and personal accounts have no net $ impact, but your business accounting books is now showing that it owes you money to reimburse you for the supplies (or whatever product/service) that your company now has.