First, you'll need to log into PreQuilt.
Once logged in, click on the Save button located on the central, vertical toolbar.
A popup window will appear. Click on Save Quilt button.
Your quilt will refresh. Don't worry! This action is the saving process.
Continue mocking up your sampler quilt. When you're finished, click on the Save button located on the central, vertical toolbar. Then click on Save & Close (update thumbnail).
You will be diverted to the QUILTS dashboard. There you will see your sampler quilt has been saved!
To continue working on your quilt or to get your fabric calculations, click on the Open button beneath your sampler quilt.