How to add friends in FB group

In Facebook, go to your HOME page, at the left side of the screen, find your list of group (if any) then find the group your planning to add your friends.  Click to open it.

At the group page, at the upper right side of the screen under the MEMBERS list, there is a box  + ADD PEOPLE TO GROUP.

Just type the name of the person you want to add, typing the letters of the person's name will open a drop down list of your friends, just click the name of the person you want to add.

How to promote / make admin in a group

Click the members list to open the page of all the members.

Click the Asterisk at the bottom right of the member, the you can select the option MAKE ADMIN or you can also remove the member from the group.

How to welcome new members in a FB group

Just click on the NEW next the the number of members, a windows of all the new members will appear, you can click the SEE ALL to view all of those new members. 

How to delete post / comment in a Facebook group.

To delete any post in Facebook group you can click the little arrow at the right side of any post, click it and a drop down menu appear, select the option to delete the post.

A confirmation box will display, just select Delete.

To delete comment, just move your mouse pointer at the upper right corner of any comment, an X will appear, you can either remove or report.