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First be sure to login to the Company Admin Area. If you are not a company admin, you will not see Login to Company Admin Area.
Here is how you can edit Issue Categories:
Issue category is the first tier of the standard issue list.
Next, here is how you can edit Issue Types:
Issue type is the second tier of the standard issue list.
Further on, here is how you add Issue Description:
Issue description is the third level of the standard issue list.