Pull the right edge of the screen over the digital crown.

If the screen feels stuck, go back around it with an opening pick to separate any adhesive.

Swing up the left edge of the screen so it's upright. The screen should be to the right of the digital crown.

During reassembly:

This is a good point to plug in your watch and test all functions before sealing it up. Be sure to power it back down completely before you continue working.

Follow this guide to apply new screen adhesive and reseal your watch.