Implement vba code on sharepoint Access web (1 Viewer)

Hi
how can I implement an update code on Access Web on SharePoint
I have a web form where the supplier /customer account balance are present. I want a VBA code to bill the customer account of the order made and also the supplier account of items ordered until payment is made
for help,the unique field in my form is TransID to set as criteria
Thank you in advance

Moore,

I am no expert with Sharepoint, I am just starting to figure it out but I did read somewhere that there is no VBA on Sharepoint versions ran through your browser. It is macros only. Unless you are using a split database with a desktop front end and linked to tables hosted on Sharepoint then your code is in the front end.

Best of luck,
Samantha