procuct category data feeds/ google merchant center

Item Warnings 44 items affected
Missing recommended attribute: google product category (43 warnings)

While items missing recommended attributes will process successfully, we recommend including relevant attributes if they are available.
Examples:
Item ID Line Nr.
57 2 Show Item
86 22 Show Item
81 42 Show Item
94 200 Show Item
72 608 Show Item
In google merchant center I get the above warnings. Where do I paste the corrections, and how do I get there. Please give me step by step procedures. Thank-you
Bruce

Our extension allows for Google Product Category plus many other options not in the default google base OC feed

Thanks a bunch, I purchased google merchant center feed and got what I needed...