how do I set up Github mention to show on slack?

[zibanndev10]

Hello,
I would like github notification to be on slack but I am experiencing difficulty.
Currently, our github account is an organization with 5 memebers.
Github account's setting has 2 Github apps installed, which are "Pull Panda" and "Slack"
Slack has "Pull Reminder" app installed and I checked all settings and configuration to be in order.
But I am not receiving any message when I put @ mention in our github issues.

Is there any totorial that I could walk through how to set up Github-Pull Reminder-Slack to show Github mention to show on Slack ?

Thank you for your help.