Those badges and e-passes are posted as pictures, usually a .jpg. As such, you cannot edit them without special drawing software. It's a lot easier to recreate them using different software. Any desktop publishing program can handle the job, but so can most word processing programs like Word. Even a photo editing program will allow you to import an exisiting image and make changes. It take a bit of familiarity with these programs to start from scratch, or to make these changes.
If you need some guidance, we can try to help. To start with, what kind of these programs do you have, and which do you use a lot? We can work from there.