Steve, inserting links:
1/ access the page you want to link to and highlight the address URL in the address bar at the top of your browser, copy it (<Ctrl>c)
2/ OR to include an image right click on the image, this should give you a menu of options, click on "Copy image location"
3/ in the MIMF message window at the top are buttons to select bold, Italic, Underline, font size and colour, then one with a blue globe and chain link icon, next is a yellow square; clicking on the globe one opens a window in which you paste (<Ctrl>v) the copied link URL then click OK: Clicking on the yellow one opens a window in which you paste (<Ctrl>v) the URL of the image then click OK