“to take off piece” change to take off the piece? Or even be specific, “pull with your hands to remove the module.”

Grammar, consider rewording. “Use the iFixit Opening Tool to remove the flexible orange strip which is connected to the battery from the motherboard” or “Use the iFixit Opening Tool to remove the flexible orange strip which connects the battery to the motherboard” or another alternative depending on your intended meaning.

Consider saying “loosen” instead of “soften” so that steps 2 and 3 use the same terms. Somebody may not know that heating the glue will loosen it, and so they will be confused reading “once the adhesive is loosened” in step 3.

How do you remove it? (Seems obvious but write for any audience, and say how to do things instead of just what to do)

Period missing for first point.