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It's just Photoshop and it's pretty simple, it doesn't require any super skills, I just used a gradient for the background and applied a style to each sign.

So if I should look for a video on YouTube that teaches how to navigate through it I would be thought better?

If you look for a video on YouTube (I don't know if it exists in 3Speak too) how to make a simple cover with Photoshop and follow the tutorial, it shouldn't be too difficult for you.

Meanwhile, a soft reminder that it looks like leoflow isn't working again.

Try this address:

http://leoflow.260mb.net/leoflow/

I deactivated the old one a few days ago

Okay, will try it out. Thanks for this.