You can update frequency of you automatic refills from monthly/bi-monthly to bi-monthly/monthly in your online portal.
Please go here (https://nimasensor.com/account/login) and login. Once logged in go to "Manage Subscriptions." From here you can see all your subscriptions. Click "Edit" to edit the subscription.
You will see a pop-up. To change the frequency, click "every month" or "bi-monthly" in the statement "on the [X DATE] [EVERY MONTH/ BI-MONTHLY] ."
A drop down menu will appear with "every month" or "bi-monthly," click the frequency desired.
Once you select the frequency click "Update subscription."
You will see the updated frequency in the description of the automatic refills.
If you experience any issues, please use Goggle Chrome and use an incognito/private window. You can open an incognito window by clicking "file" in the upper left hand corner.