A grom or grommet isnt necessarly a biginner surfer but a YOUNG surfer... usually under the age of 15. Most of the time people that are called groms are youngins who RIP (are good).
To play a song in the background of your slide show, do the following: On the Insert tab, select Audio, and then Audio on My PC. In the file explorer, locate the music file you want to use and then select Insert. On the Playback tab, select Play in Background.
Make a new slide size the default for new presentations. On the Design tab, click Slide Size, and then click Custom Slide Size. Follow the steps in the section above to choose the slide size you want. On the Design tab, click the More arrow in the bottom-right corner of the Themes group.