by using the instructions here

H OWTO U PDATEYOUR R EQ T EAMAFTER R EQ H AS B EEN S ENTFOR A PPROVAL 
Search for your requisition number in the Search box at the top of the screen (if the box is not visible, click the blue Search link.)

The Req Search Results box will appear 
Click on the box next to your req name, then click the UPDATE MULTIPLE REQS link on the left 
Click on the LIST button next to the “Select to Add to Requisition Team” box 
Clear the box at the top which says “Select(3)” and enter in the last name of the person you wish to add. Click SEARCH. 
Click on the name in the box on the left to move to the box on the right. Then click OK. 
Click the circle that says “OVERWRITE EXISTING”, then SAVE. 
You will then receive a message that says “All Requisitions updated successfully” 
You can verify by clicking on the requisition number and viewing the req.