To start with the installation, Log-in as Administrator into SuiteCRM. Navigate to the Administration page and click on ‘Module Loader’ to install the package. 
Browse the SuiteCRM Package zip file and click on ‘Upload’ button. 
After uploading the package, click on ‘Install’ button to install the package.
Click on ‘Commit’ button to finish the installation. After successful installation, you can see ‘WordPress Customer Portal’ Plug-in in Installed plug-in list on Module Loader page. 
Now, need to repair your SuiteCRM Instance. For that, navigate to Administration page and click on ‘Repair’ link, then click on ‘Quick Repair and Rebuild’ link.