First, you must log in to your JGive account by logging in from the home page.
Next, click on 'My Account' -> 'My Personal Account'
Click on the Account Settings button and scroll down a little until you reach 'Connect To Employer':
Now, you need to enter the email address associated with the employer's domain, and a request for confirmation will be sent to your employer.
Upon the employer's approval, you will receive an email confirming the linkage of your personal account with the employer's account.