Thanks for the response. I want to be able to get into Safe Mode with Networking in order to be prepared for the following: I may need to access the Web while trying to fix a problem, in order to get help at the same time, possibly from this forum. I do not remember things very well and do not find looking things up followed by trying to act on advice later very effective.
I cannot get Safe Mode with Network to work in the normal way, though I know it can be done because I have done it once following concurrent instructions on the phone. But I do not remember the procedure.