I am trying to insert an image into a blog page. However, the only option I'm
being allowed is to insert the image from the Internet. "From My Computer" is
greyed out.

I see we're all getting many replies.

Can you please let me know the type of blog server used and also the version of Contribute you are using?

Hello,

Sorry... I gave no details! I have the latest version (5) for Mac of
Contribute (CS4). I use WordPress. I uninstalled the software, then
reinstalled, and suddenly this option to select an image from my computer came
back.

Thanks for your reply.

In Contribute CS4, the menu items and the other items in the toolbar will be
enabled only when those options are supported by the blog servers.
Go to Contribute-> My Connection, Select the blog server and click Configure
button. You can see the blog server configuration dialog opened.
Click on Update Support button to get the latest support information.
In the above list box you can see all the supported items with green tick
mark. So need for re-installation.
Thanks.

Thanks Dominic!