To show UPS rates with Boxify, you need to have a UPS account. So if you do not yet have one, go to UPS.com and establish an account.
You will then need to connect Boxify with your UPS account, which you can do by going to the Boxify dashboard and clicking on the button marked, "Configure UPS." Then click on the button marked, "Connect to new API at UPS.com."
Then on the screen presented, enter information about your UPS account and the kind of UPS rates you want Boxify to provide to your shop: UPS Retail rates, UPS Daily rates, or your account-specific (negotiated) rates. Then click on the green button at the bottom.
If you have not previously connected Boxify with UPS, you will be taken to a page that describes the two steps needed to connect Boxify with UPS. Click on the button in STEP1 to open a special page at UPS.com in a new browser tab. Check the checkbox there allowing Boxify to read information for you from UPS, and log in using your normal UPS username and password.
After doing so, follow the instructions, which explain that you can now close this second browser tab and confirm the activation on UPS in Boxify in your original browser tab (by clicking on the button in STEP2). You will have 10 minutes to do so.
Should you have trouble authenticating Boxify at UPS.com, check this Knowledgebase article, which describes some possible reasons a user may encounter difficulty.