I make my animation, then click on 'Render' and then I click on 'Save as .GIF' and then JuiceFX just takes me to file where it is installed, instead of saving the gif. This doesn't happen when saving throught the other options. Am I doing something wrong while saving to GIF or what?

It should show you the folder whre the file as been saved, some file with the name "result3.gif" or similar. It exports on the app directory, so chck it, it should be there.