DELETING & RESTARTING SMART FTP CLIENT AGAIN

Hi,
I'm a newby using Smart FTP Client and I've made a complete nonesense of my input and trying to rectify problem leaving me utterly confused.
To sort this I would like advice from someone on:
1. can I completely delete all current input and start all over once again. If so how?
2. If solution to para 1 is yes can I re-use my existing Login and Password as if nothing has gone wrong?
Grateful for any advise.

To delete and restart without re-installing, use the Backup Tool.