Here you can find how to proceed to modify lead infos in the lead database, especially the market and lead department fields.
1. Click on the smart list in the lead database (ADMIN_Leads with market is empty > Marketing Qualification or CORP_FA_Target_Without lead department)
2. Select the lead you want to edit (you can select several lead at the same time)
3. Click on Lead Actions > Marketing > Change Data Value
4. Select the attribute you want to modify
5. Select the new value
6. Click on Run Now
Hope this help