For frequently used images like a logo which you use for all of your forms, you can store images directly in FireStart in the image library. To open the library, click Menu > Preferences > Server Settings > Image Library. To add an image, click the Add button at the bottom of the window. Select an image and click Open.
If you want to add a description to the image or if you want to rename it, simply select it and now you have all the properties shown in the right panel. After changing the information, don't forget to save all your changes by clicking Commit changes.
The image can be removed easily by selecting the image and clicking Remove at the bottom of the FireStart client.
This is an example of the image library what it looks like with the FireStart logo stored in it: