First you need a web server (I don't think you want the entire world accessing your PC hard drive) and a domain name, then find some gallery software and set it up....
OR go here: http://www.finescale.com/fsm/community/forum/topic.asp?TOPIC_ID=2331
post your images per the instructions and link to them.
Thelink will have to be altered to display properly:
Here is the link copied from the address bar:
http://rongeorge.com/modules/Gallery/album58/AMtech_HS_123_11
To make it display as an image in a post you need to put it in "Image tags"
(I have added spaces for the purpose of this conversation). It will look like this:
Then you need to edit the actual URL; Replace
modules/Gallery with albums and add .jpg to the end. It should look like this:
Once the spaces are removed from the Image Tags you get this:
This sounds complicated but it really isn't.