Here is the basic skeleton to fix it if you wanna remove the original icon:

here is the before  (showing the problem without helping html and pixel html ):

now here is the after (fixed problem with helping html code and pixel html):

if you want me to further help ill proudly answer c’:

This is just a guide to help change this theme’s icons:

Step 1

 look for html like this

Step 2

(note: its best to use web browser google chrome for this)
look for pictures that you would like to use for this

and right click and click on “inspect element”

on the chosen picture:

Step 3

once you click inspect element; it already highlights the wanted image html so right click again and click on “copy as html”

Step 4

 now insert your html into the boxed section below:

it should look like this c;

i hope this works<3