Method 1
In the main menu, head to the Ownership tab and choose Cap table from the dropdown menu.
Navigate to the Shareholders tab from the top menu.
Find the shareholder with the error in their transaction and click on their name
Scroll down to their 'Transaction history'
Click the three dots on the incorrect transaction and you will see Delete Transaction. OR if there are multiple incorrect transactions, select each one you would like to delete and then click More at the top of the history and you will see Delete Transactions.
Method 2