How do I charge different freight or delivery fees for different customers?

This is a two-step setup — create the rule, then assign it:

1. Create your freight rules. Account menu (top right) → Company Profile & Settings → Freight Rules. Each rule sets a delivery fee, cut-off time, minimum order value, free-delivery threshold, and optional custom delivery days. Use Add New Rule to create more and mark one as the default.
2. Assign a rule to a customer. Open the customer (Customers → Customer List → the customer → Freight tab) and pick their Freight Rule. Each customer can have one rule, which overrides the default for them.