Start values can be modified by clicking on the start value.
If this value is empty or >100, it means that the keyword was unranked when the keyword was first added in.
After modifying the Start Value, in order for the new baseline to be reflected in the 'Life' column, you'll need to update the keyword and refresh the page.
We hope you find this helpful! If you need any further assistance, please contact us and we'll be more than glad to help you out.