Flame comes with a number of export presets that should cover most of your needs. But you can also create your own presets. 
Whenever you edit an existing preset, it gets appended _custom. That new custom preset remains until you change project, exit Flame, or click Reset. 
To create a new export preset:
- Select an Export Type. 
- Select a Format Preset. Select the preset that is the closest to what you want, to minimize the amount of required configuration.  
- Enable Show Advanced Options. 
- Edit the settings as required. Notice how the Format Preset box has appended the preset you selected with the _custom suffix.  
- Do one of the following: - To cancel your edits, click Reset. 
- If this is essentially a one-off customization that you will not need later, click Export to export your sequence. You can always save that preset at a later time: a customized preset remains until you exit Flame or change project. 
- To keep this new preset, click Save. You now the new preset in Project or Shared sections of the Format Preset drop-down menu, and the original preset back in the Autodesk section. 
 
Tip: Consider creating an Export preset with padding set to 0 to export single-frame clips without any file numbering. And to avoid overwriting the media files, Flame will automatically name file sequences of more than one frame with the default padding of 8 digits.