what u mean by holding I-20? You just need to fill the application for UTA. That's all. And send the previous school transcripts, toefl score, I-20 copy, I-94 etc. You don't have to fill no extra form to get Phi-theta scholarship or general; transfer or outstanding scholarship. You said you are in community college. So, you can be a member of Phi-Theta if you have your GPA 3.5 or above. If you have 3.5 above, you are automatically eligible to for  instate tution fee + $2000 transfer scholarship per year. And, if you are PTK member, your scholarship amount will be increased by $1000 per year for 2 years. If you have 3.75, you will be getting $3800 per year scholarship others remaining same as above. If you have $3.25 or above or community college gradiate, you will still get instate + $1000 per year scholarship. However, scholarship amount changes time to time. So, contact financial aid department for the current policies.

Remember the application deadline and scholarship deadline is different. So, apply early. Seems like you have already applied. Good Luck!!