On the web:
Select the Trading tab at the top of the page.
Select the account you want to use as follows:
For local shares (JSE), select your ZAR account
For international shares, select your USD account
Click in the search bar, and search for your instrument.
Select "Trade"
On the trade order screen select "Investment value"
Input the value you would like to purchase. The quantity (portion) you are purchasing will be displayed just below the value.
Select Submit to complete the trade.
On the app:
Select Transact at the bottom of the screen.
Select the account you want to use as follows:
For local shares (JSE), select your ZAR account
For international shares, select your USD account
Search for the instrument you want to purchase.
Click on the instrument and select "Buy"
Select "Investment Amount"
Input the amount of money you want to invest in the "Amount" block
The portion of the share you are purchasing will be calculated
Select "Continue"