If you need to figure out how to access the necessary credentials, head to Xero's docs for a detailed walk through.
Let's start by selecting the Xero source from the potential data sources.
Now that you have selected Xero, you need to input your OAuth credentials.
Once you have copied these in, click Save. The Save button will then turn into the Connect button. Go ahead and click it.
You will then be prompted to log in to your Xero account. Go ahead and sign in.
Once you sign in, you will be asked if you want to give hotglue access. You should click Allow Access.
And that is it! You have succesfully linked Xero!
Now that you have set up your source, you need to configure your mapping. Click on the field map button below the Xero source.
Now that you have done that, you can select the gear icon next to any of the Tables that you would want to configure the mapping for.
Once you have selected what you wanted, click confirm, and then save on the original Table selector. You have completed mapping for Xero!