For all versions of MeasureSquare 8 Desktop: This will show you how to replace individual tiles with your chosen tile on your drawing. We will assume you have already created a pattern with your tiles.
Step 1: Right-click on the tile that you want to place onto the diagram in the Project Items section (or the Product/Services database if that's where you're modifying), and click "Replace Tile in Diagram"
Step 2: Click on the individual tile or tiles that you want to replace, either clicking one by one, or by clicking and dragging your mouse to get larger areas.
Step 3: Right-Click your mouse to save the changes. If you are planning to click Undo, do so after you right-click.