To chase approvers you will need to ensure you are a administrator of Access Approve firstly on Access Evo. This can be granted to you by a organisation administrator.
If this has been granted on your user, then you will also need to enable it within Approve yourself. You can do this by the following:
When in Approve, go to Settings
Click Approvers and search for your user.
Click Actions, Edit and identify the database where the setting needs to be applied (expand the details if necessary).
Then tick on Can Chase on each Database you need it for.
Save to confirm the changes.
You will then have a new option available in the left hand column, called Chase. From there, you can chase all outstanding Transactions.