Do you have a MK3-USB adapter?
If so, do you have the USB-C or USB-A plug?
If neither, do you have the VE.Bus smart dongle?
If you have the smart dongle, you can't do anything meaningful.
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3.3. VE.Bus Smart dongle limitations
When connected over bluetooth, using the VE.Bus Smart Dongle, only status data, voltages, and other information can be read. And it can be operated: switch between On, Off and Charger-only mode, and set a Shore current input limit. No changes can be made to the product.
An MK3-USB is required to change settings and perform firmware updates and settings. And, as that requires a USB port, it is not possible to change inverter/charger configuration or perform firmware updates on a Apple iPad or iPhone.
VictronConnect does not work with the MK2-USB.