Please remind us what version of Premiere Elements you are using and on what computer operating system it is running.
Assuming version 12/12.1 for example....the following from Premiere Elements 12 Expert Guided
"Adding Transitions between clips"
My interpretation of the "Post the guided edit,...." is that it means click Done
to get out of Expert Guided so that you can continue with applying the
default transition to more than one pair of clips at a time.
That seems to be the intent of the message.
Please review and consider.