Edit google cloud print plugin on wordpress

Hi, I am using an existing wordpress plugin that allows google cloud printing. I would like to amend the order slip printed to include the following: 1. The delivery date and time which taken from another plugin. The code to fetch the data from my other plugin is this. // below you can fetch the exact delivery date & time get_post_meta( $order_id, <Delivery Date Label>, true); get_post_meta( $order_id, <Time slot label>, true 2. Reduce the spaces between the tables on the order slip. 3. Have print out cover most of the 100mm X 70mm printing label. The printer use is Zebra ZT410. 4. Amend the css to remove the black background in one of the table column. 5. Remove the credits at the end of the order slip and change it to my preferred wordings Other information: Google cloud plugin link: [login to view URL] Delivery time and date plugin link: [login to view URL] Please see uploaded file for an image for clearer understanding.