I'm currently using Flip-a-Clip for my mobile phone. I have Macromedia Flash on computer but the problem is my computer is located on my third floor, I can't go up there during school night, I only can go up there on Friday and Saturday. Does Stickpage allows me to use Flip-a-clip to animate? Or is there any other suggestions?

Quote from AscensionAnims

Does Stickpage allows me to use Flip-a-clip to animate? Or is there any other suggestions?

I'm sure you're allowed to animate with any softwares and share it here.
except some competition's requirements

ya, like he said, for just general animation and RHG battling, you can use what ever, but some competitions or collabs might require a different software, depending on the rules of the event