My question involves unemployment benefits for the state of: California

I was on full UI up until Aug 20th but then got a part time position with a pharmaceutical benefits company as a benefit coordinator which was basically an IT position because it had to do with coding and programing benefits on the computer which going into it I had no prior experience in that industry. I went through a little more than 3 weeks of training but didn't do well and today my supervisor told me that it would be best long term that I don't work for the company anymore because I didn't do well enough. I wanted to know, When i get my weekly paper work to fill out for UI, any ideas on what I should put for the reason I no longer work there? and I should be able to go back to full UI right? Thanks for any advice!