Yes, just create a flickr page and upload your photos, you can make folders and all sorts of other stuff but for simple use just upload. When setting up the account make sure you select share images, it's in one of the settings so if you can't find it let me know and I'll do a walk through.
Once uploaded select your image so it's the main focus like so
In the bottom right is a curved arrow, called 'share' click this and you get this page
You need to select BBCode and the size of the image you wish to share, it will then give you a url link which you copy and paste into the WT thread like thus.
It'll all look goobledegook like this
until you save the message at which point it will insert the picture at the size you selected with a direct link below for others to follow to see the full size image.
Flickr is free and you can store as much as you ever want, they say you can never fill it up, not sure how true that is but it must be one hell of a server or servers to make that sort of promise.
The only downside is that if you click the picture to make it larger then you get sent to Flickr and do not remain here, that's why I simply upload the photos here, or even better, just use one site....this one of course
Hope that helps