Step 1: Go to left-hand-side menu -> Recruitment -> My Applicant 

Step 2: Select the candidate and change his status to "Approved/Placed" (Please refer attach screenshot).

Step 3: You will find "ROLL OUT OFFER LETTER" below status field, click on it.

Step 4: You will redirect to "Roll out offer letter", please fill that details and click on next button.

Step 5: Fill the candidate details like basic info, profile info and salary details and click on save button below.

Step 6: It will redirect you to offer letter page -> click on option button (please find the attach screenshot for your reference) and "click on view offer letter".