Upload your pictures to a service like Imgur or Catbox. Then click in the picture icon and insert the image url
MangaDex Forums
gimme_yuri_plz
Fujoshi_Spy
OH OKKK, THANKSSS FOR TELLING, I APPRECIATE IT💗
BakedBanana
More thorough explanation if you need it:
https://forums.mangadex.org/threads/image-on-comments.2470197/#post-28163637
https://forums.mangadex.org/threads/image-on-comments.2470197/#post-28163637
Fujoshi_Spy
THANKSS FOR THISSS
OrangeFuck258
Good to know
gimme_yuri_plz
Nice pfp, @OrangeFuck258