1. How to Enable the Message plugin? 

STEP 1: Access to Admin Dashboard => Plugin Manager => Message => General tab.

STEP 2: Setting Enable Message = Yes

STEP 3: Click Save Settings then Clear global cache

2. How to limit sending messages? 

STEP 1: Access to Admin Dashboard => Plugin Manager => Message => Permission tab.

STEP 2: There are 3 types of limits: limit users, limit messages and allow chat

(1) For limit users can chat with, Input a number to “How many users can chat with (-1 is unlimited)” column

Example: Input 10 to member role, this role can chat with 10 users only.

(2) For limit messages can chat with, Input a number to “How many message can chat with (-1 is unlimited)” column

Example: Input 10 to member role, this role can send total 10 messages.

(3) For Allow or un-allow chat,  Check/Un-check to box for each role in “Allow chat” column

Note: 

Input -1 = Unlimited messaging or chatting with users

Input (Zero) 0 = Can’t chat but can see received messages

Un-allow chat = Can’t not open messages page, can not see anything in massages

Step 3: Click Save then Clear global cache