diff --git a/How-It-Works---Cara-kerja.md b/How-It-Works---Cara-kerja.md
index 0176949..048dd7a 100644
--- a/How-It-Works---Cara-kerja.md
+++ b/How-It-Works---Cara-kerja.md
@@ -1,3 +1,13 @@
+## Index
+
+- [Installation](https://github.com/hotspotbilling/phpnuxbill/wiki)
+- [Cron Jobs](https://github.com/hotspotbilling/phpnuxbill/wiki/Cron-Jobs)
+- [FreeRadius](https://github.com/hotspotbilling/phpnuxbill/wiki/FreeRadius)
+- [Getting Started](https://github.com/hotspotbilling/phpnuxbill/wiki/Getting-Started)
+- [Creating Payment Gateway Plugin](https://github.com/hotspotbilling/phpnuxbill/wiki/Payment-Gateway-Plugin)
+- [Selling Paid Plugin or Payment Gateway](https://github.com/hotspotbilling/phpnuxbill/wiki/Selling-Paid-Plugin-or-Payment-Gateway)
+- [Creating Themes](https://github.com/hotspotbilling/phpnuxbill/wiki/Themes)
+
 # How it Works
 
 PHPNuxBill was first made specifically for selling Vouchers, where Vouchers were made at PHPNuxBill and then sold to customers, Vouchers did not enter Mikrotik, for this a Mikrotik Login Template was needed which took customers to the PHPNuxBill page for Registration.