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Once the installation of Mattermost in Centos 7 has been completed and everything is working fine as mentioned in the article (Install Mattermost on Centos 7) you can follow the below steps to complete the configuration part.
1) Create the System Admin user and set up Mattermost for general use.
a) Open a browser and navigate to your Mattermost instance. For example, http://<IP-ADDRESS-OF-MATTERMOST-SERVER>:8065.