From the Setup screen click on "Records" in the "Misc" section which will open the "Categories" screen. Under "Symbol" you can enter just about anything. I would suggest a "*". The "Priority" column tells RaceTab which record you want listed first. Entering a "1" tells it you want that record listed first. Under "Name" enter something like "Conf" or "State" as the record list applies.
To begin entering records click on the pencil icon.
You will find 5 columns: "Gender", "Record Holder", "Date", "Event Code", and "Mark". Gender, Record Holder and Mark are pretty straight forward. The two that may cause issues are Date and Event Code. Under date you can need to put in a full date like "3/14/2018". If you leave it blank or just put in a year it defaults to 12:00:00 AM. (It would be nice to be able to add just the year.) Each line in the "spreadsheet" is a new event. If two more athletes share a record, just add another line for each athlete.
The Event Code is how RaceTab refers to a particular event. For example, the 100 Meter Dash is 100m, 4 x 400 Relay is 4x400m. You can find the event codes double clicking on any of the events listed on the "Events" tab. Under "Meta" you will find "MileSplit Code:".
There doesn't seem to be any way of formatting the records, i.e. justifying or setting up tab stops. That too would be nice.