Thanks for all the information you can add:
You can adjust the length and width this code:
[img width=100 height=50]https://i.imgur.com/j8ED7ld.png[/img]
preview:
add a simple brief description of the image "You can add as many words as you like"
* Displays on mouseover.
[acronym=Brief description of the image][url=https://i.imgur.com/j8ED7ld.png][img width=100 height=50]https://i.imgur.com/j8ED7ld.png[/img][/url][/acronym]

Or for link:
* Displays on mouseover.
[acronym=Brief description of the image][url=https://bitcointalk.org/index.php?topic=3974517.0]Guideline on posting images (with size adjustments), hyperlinks[/url][/acronym]
Guideline on posting images (with size adjustments), hyperlinks
You can also add animated images after adjusting the end to .png