No tag entry in register

When you enter a transaction you either put the tag in the tag column or you can enter it at the end of the category by using a forward slash / to designate the tag. You can add a column for Tag if it's not showing. To add columns to the register

Select "Account Actions".

Select "Register Columns..."

Or in newer versions you can click the gear icon in the upper right hand corner of the account register to get a list of available columns. Click to put a checkmark in the missing column(s). (Also explore the new columns, added to your version of Quicken, if they might be helpful for your needs.)

The Starter Edition doesn't have tags.