How do I use an adobe stock ai file as font?

lolapea,

If you settle for a font as suggested by Danny, you may have a look at these sites (apart from the second one, you can use your image directly to search for similar),

http://www.whatfontis.com/
http://www.identifont.com/
http://new.myfonts.com/WhatTheFont/
https://www.fontsquirrel.com/matcherator

People mistakenly interchange "Typeface" and "Font". A typeface is a style or design of letters, which are actually graphic objects, like the file you downloaded. It is not editable or live text. You can certainly ungroup them to move/copy individual letters and space them out manually, if you don't know how to find or use font generators to convert them to a font.

A font is editable text. Sites that contain downloadable stock artwork typically have typefaces, not editable text. That can confuse those who do not know the difference between typefaces and fonts. Therfore, some people naturally think that means they are fonts that they can edit on the fly to type with, when that is not the case. 

I agree with Danny_Whitehead_ to have this labelled as a font is extremely misleading though I do not think it was the creators intention to do so. Picking a similar retro font, would be less stressful and time consuming. 

As has been said, that isn't a font, and think it's even slightly misleading for them to sell it as a 'typeface'.

I think the best option would be to cut your losses, choose a suitable retro-ish bold, condensed sans from Adobe Fonts, and use Illustrator to apply the roughness and halftone effect. You'll also pick up some useful skills along the way, for creating such effects.

This is not a font as most people would understand it. Someone has just made some letterforms in an AI file.

The easiest way to make it into an actual font would be to use something like Fontself or Jongware's IndyFont, if you have InDesign -- and if it is worth the trouble.

https://www.fontself.com/

http://www.indiscripts.com/category/projects/IndyFont

Can you tell us the name of the typeface?

Did you buy it from Adobe/font website? I could not find it.

Definitively, a font or typeface must use a fomnt  standard format, .ttf, .otf, .woff, .pfb+pfm,....

You can either Move around the shapes to do "typesetting"

Or first make a font. Use for example the plugin Fontself or the app Birdfont to do that.