I got one for Christmas too. I read the manual and understand it pretty well. Its been on for about 5 minutes total, and hasn't been shot across yet.
The red ST button switches between strings. The strings are 10 shots in length, and there are 6 of them (60 shot memory). The FU button switches to the various functions on the strings. It will show you high, low, extreme spread, standard deviation, etc. for each string of shots. The forget button can be used to clear an errant shot in a string or clear a whole string.
To save a string, switch to the next string after firing before switching the device off. To save all 6 strings, cycle through them with the ST button before switching the device off.
If you think you've messed something up, leave it alone for a minute or so and it will return to read & record to the current string. Pressing the FU button once while in read & record will show you what string you are on. Let it sit and it will return to read & record.
What are you having problems with in particular?
ETA: I've got a Bachelors degree in Computer Engineering and am working on a Masters in Electrical Engineering. So I guess that qualifies me for operation of the thing [%|]
Jonathan