Step 1
After logged in, click on Member Price.

Step 2
Check Enable special discount for member.

Step 3
Select Discount Type, for member.
It could be percentage discount of pricing or a fixed amount discount.

Step 4
Enter Discount Amount.
If Percentage was selected in Step 3, discount amount will be the number of percentage;
If Fixed Amount was selected, discount amount will be the number of pricing amount.