Now that you have installed the Safestrap recovery, You probably want to flash a custom ROM. If you are familiar with Clockwork Mod recovery, then you will feel right at home as there are only a few (yet important) differences.
Reboot your device and walk away once you see the new ROM has loaded and you are greeted with the welcome screen. Give the new ROM a chance to settle in (5-10 minutes is good). This may sound unnecessary but it usually helps with initial problems and apps force closing when you do this.