|that password can be changed via a router's admin/management page/section for wifi settings...|
If you do change it;, be sure to keep a not of what you change it to (or to what you change it...). If home security is not an issue - it's in your home - then stick a label on the base adjacent to the one that is already there showing the current default/factory set password. Then you'll know where to find it in the future. Also perhaps email it yourself in a couple emails and leave the emails on the server as well. A form of (free) cloud storage. Perhaps also making an oblique (vague but recognisable) reference to it in the mail's subject/topic line).
But as per Derek, what make/model router do you have. That info will enable pholks here to help you more specifically with regard to "your" router and its settings etc.