How do you add images in posts?

[Don Vito Corleone]

And also, how do you add the big black text, found in posts like these https://uselectionatlas.org/FORUM/index.php?topic=265331.0. I tried pressing the increase font button, but it didn't do anything.

[Modernity has failed us]

For images you can just hit the  icon and put the link between the brackets.

for big text, you do bold text, which is the  icon and you can hit the  icon to change the font size.