There are several ways to approve, reject or delete messages needing moderation. 

By Email:

As owner or moderator, you will receive a notification email for messages needing moderation. To receive these notifications, you must have permitted this by ticking the checkbox in Subscription, Notifications - Email when there are messages needing approval.

- To approve this using email, reply to the notification message. This is the easiest way to approve. No message is required, just an empty reply. This reply will be sent to a system-generated reply-to address for that message ( groupname+approve+long series of numbers@groups.io ), not the original sender. 

- To reject this message using email, and to have the sender notified of this, click on the link in the notification message and forward it message to:

groupname+reject+number@groupname

- To delete this message using email, click on the link in the notification message in the email footer and forward this message to:

groupname+delete+number@groupname

(In most email clients, these mailto: links will open a new email with the address already filled in. Easy peasy!)

Notes:

1) You must send these moderation responses from the email address that is subscribed to the group.
2) The notification message will expire after 14 days. If you do not take action within that time, the pending message will be automatically rejected.
3) If you wish to edit the message, you have to do that online (see below).

Online:

You can either click the "View this message online" link in the notification email, or to to https://groups.io/g/GroupName/pending (or Admin > Pending.) 

From there, there are two options. 

1) Select several posts using the check boxes to the left of them and click the Approve (or another) button.

or

2) Click on the first one to open it, then use the buttons at the bottom to Approve, Edit, Reject, Delete, etc. Once you take care of the first pending message, the next one will automatically open.

Possible "problems":

1)  If your group has several Moderators/Owners, it's possible that someone else is already performing moderation duties on the affected message. If so:

- Via Email:  If another moderator or owner has already dealt with the incoming message, you will get a rather cryptic reply email, depending on your email client. However, the email to you will say:  500 This message has already been approved or rejected.

- Online:  If another moderator or owner is dealing with the message, you will see a "claimed by" badge on the message. You can just back out.

2)  To moderate messages online, you must first be logged in. Login instructions can be found at https://groups.io/static/help#password . As long as you don't delete your browser cookies, the login will persist for 30 days. Once you finish that, you should see a light blue status badge at upper left (next to the Home button), confirming that you are logged in with either a Moderator or Owner account. At that point you can go to Admin>Pending and perform your moderation duties.