Help about friends

The answer is no you can't add people to Frontline, it is an invitation sent out to players to test new things. It appears to have specific critiria to send an invite to someone and then you must maintain activity or the invitation is taken away.

Thats okay, how active to I have to be, sometimes Im off for 3-4 days and I know games go AFK after 2 but I come back

This is from the Frontline Pioneer tab:

Hello Frontline Pioneer!

This program recruits users that are active and willing to test new game features in Call of War.

You will have access to changes and features before everyone else and you can directly report your feedback and bugs to the developers. Similar to High Command your participation in this program will be mentioned in your profile.

In order not to lose your Frontline Pioneer status you have to create or join a Frontline Pioneer game during the next 7 days after you received the status. Afterwards you should not be inactive on the Frontline for longer than 4 weeks.

So note that after going your first game within 7 days that it is not inactive for more then 4 weeks.

Thanks!