Hi and thanks for using Just AnswerCan you please tell me what type of tablet you are using? Is it an Ipad or something else?
Just as an FYI there is a great video for this printer on Canon's website showing all the ways you can use the device http://www.canon.co.uk/For_Home/Product_Finder/Printers/Inkjet/PIXMA_MG3150/#p-specification2
You can click on the Learn and Explore button and it will show you all the features. Once you respond with the tablet type we can continue trouble shooting