http://www.imgur.com is the most commonly used image hosting site here.
Once you upload your image onto there then select "copy link" which will give you a url like this:
https://imgur.com/DjL8F6scWhat you do first is add in your original image extension to the end of the image such as .gif , .jpg or .png, you may find your image's extension by right-clicking it and selecting properties.
Afterwards paste your URL inside the IMG tags like this:
Code
[IMG]https://imgur.com/DjL8F6s.jpg[/IMG]
and...
Wala

An easier alternative to this is you can make a minimal purchase of $10 fg per month to gain a customer perk AND/OR apply for the donor forums which will grant you various perks and allow you to directly drag an image into your post or reply screen and it'll upload itself automatically, saves a lot of time and hassle.
Read about it here:
Customer perks-
https://forums.d2jsp.org/topic.php?t=74114203&f=28Apply for donor forums-
https://forums.d2jsp.org/info.php?p=30