InsertText was working on my computer but for some reason I can no longer see the toolbar.

Outlook (unfortunately) with all its different versions and service packs sometimes has problems like this. If you are using Outlook XP/2003 and it has disabled the AddIn, start Outlook and reactivate InsertText by doing the following:

If you are using Outlook 2002 and 2003:
Start Outlook and go to your Inbox
Select Help> About Microsoft Outlook
Click Disable Items button,
select InsertText
click Enable.

If you are using Outlook 2007:
Start Outlook and go to your Inbox
Select Help -> Click Disable Items
On the screen that appears, select InsertText
Click Enable 

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