If you are unable to find a particular Instrument/pair on MetaTrader, you just need to select "Show All" in the Market Watch section. 

1. Right-click on the Instrument/pair section 
2. Select "Show All" 

Mobile App:

• To be able to add more pairs on a mobile device, you will need to click on the “+” icon on the top right hand of your screen as shown below.

• You will need to choose the appropriate category.
  
  

• Then choose the pair/instrument you want to see.