If you're in the board format for deals and tickets, switch to the table view. To do this, in the upper left, click the listViewtable icon.
Select the records you want to edit. You can apply a view to your table to help filter out specifically the records you want to edit.
To edit a few individual records, select the checkboxes next to the records you want to edit.
To edit all of the records on a page, select theSelect allcheckbox at the top of the table. Then, to select all of the records in the filter, click theSelect all [number] [records] link.
At the top of the table, you can select Assign, Edit, or Delete. Other options like Create tasks will only work on records selected in the current page. They will not work when all records, including records beyond the current page, are selected.