Hi Pilou 
Unfortunalty the enstil.a Website is closed now 
the Devs give up
 
For a "really free" Stable Diffusion Online Side 
i recommend this one:
 https://enstil.ai/
 
(you could use the Prompts from Lexica to create Images 
a online library of Stable Diffusion Images and there Prompts
 https://lexica.art/?q=letter
In DreamStudio you have only 200 Credits free 
btw it is cheaper then Midyjourney, Dreamstudio 
cost only 1 cent per Image
 
Here some Images made with enstil ai 
 
The Prompt was:  
very beautiful photograph of the letter 'M' with a rusty iron texture
 
The "i" was hard to get so i edited a "L" roughly :)
  
 
 
With the little Download sign in the upper right of the Image 
you could download a 512x512 Image of your result  
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