Once you are in the TurboTax Community you can search a question or keyword anytime. Here is a link to bookmark to navigate to the Community: Community Home
You don't have to be signed into TurboTax at all to use the Community.
On your My Profile screen you can see your past questions towards the bottom of the screen. This is helpful when you want to take a look at your posts - you will need to be signed in to do that. To get to the My Profile screen go to the three person drop down icon image.