Explain the process of merging the main document with the list of recipients.

To merge the main document with the list of recipients, follow these steps:

Step 1: Click on 'More items' in the Mail Merge pane.

Step 2: An 'Insert Merge Field' window appears on the screen. It contains all the selected fields.

Step 3: Click on 'Database Fields'.

Step 4: Now set the position of the cursor where you want to insert the field values in the document.

Step 5: Click 'Insert' to place the field values at that position.

Step 6: Press the 'Enter' key and continue the process for the rest of the field values.

Step 7: Finally click on the 'Close' button.

Step 8: Click on 'Next: Preview your letters' from the lower part of the Mail Merge pane.

The main document will be merged with the list of recipients.