First you will need a set of emoji pictures to work with:
Then you have to crop, resize and save a single tiny image for every emoji you wish to use. For example like this:

Then you just need to copy the HTML/BBCode of the emoji you wish to use from your album and paste it as an image in the middle of the text.
The limitation is that you may not be allowed to use images on someone else's comment area here at Ipernity. But at least you can use them under your own images and files.

▷ Good to know before you start using images on comments
5 comments
Au Cœur... diagonalh… said:
are u a self-mademan? ;;;---)))
Sami Serola (inactiv… replied to Au Cœur... diagonalh…:
* ઇଓ * replied to :
Taormina said:
Used sparingly, they complement a sentence in a funny
way and sometimes "on the fast" (What´sApp)
they are indispensable. Here at Ipernity I see this rather with mixed feelings...
then "thumbs up" are posted and endlessly many "stars" are distributed.
I hope that the written word will remain the most important part of a comment.
Sami Serola (inactiv… replied to Taormina: