want to know how to replace 'place markers' with actual transaction info

Jane

Using Quicken Home, Business & Rental, R 17.6, Build 27.1.17.6 with windows 10.  Had problems with investment acct earlier and Support solved problem by creating place marker transactions.  I would like to go back and replace those place markers with actual transactions from my printed Schwab paperwork. because my cash is off and I traced the error back to the time of the place markers.  Is it OK to just type over the placemarkers?
Jane

Tom Young