I think there's two things going on here. But, the editor should be open to discussion because she's a member of the team.
Anyway: 1) If X then Y is fine. The conditional clause can be introduced that way. However, where I think the editor is going is the need for coordinating conjunctions to avoid comma splices. 2) Click File, click New. That comma splice becomes, "Click File, then click New." which is technically incorrect and ought be "Click File, and then click New." However, "Click File, then click New." works for me (though I use Click File > New." or a semi-colon, depending on context.) ====== T. ============ I won. I voted for Char James-Tanny for STC secretary. ============