Welcome to the Rogers Community Forums!
You've definitely come to the right place! Do you know what kind of modem you currently have?
Please check out the video on the knowledge base article How To: Change Your Home WiFi Password for step by step instructions :).
You can also check out Change WiFi Password Using the MyWiFi App and How to Find or Change your WiFi Password for the Rogers Ignite WiFi Gateway Modem for further assistance.
Let us know if you have any follow up questions.