At this point you can remove the bottom lid assembly from the Dolphin pool cleaner, be careful when lifting the assembly out of the cleaner for there may be debris and residual water in the bag. The bag may have also become loose during operation sure when removing the assembly from the Dolphin pool cleaner the contents do not spill.
Next step is to remove the bag, first you will want to grip the mouth of the bag at the base of the bottom lid assembly and pop the fabric band over the lip of the base. If your bag is full, you might want to attempt this while the Bottom Lid Assembly is upside down, so as not to spill any of the contents.
Once the bag is removed, discard the contents. If you plan on simply emptying the bag and reusing it, then remove the contents and inspect bag to be sure there are no holes or obvious damage. If you are replacing the bag on your Dolphin Pool Cleaner, you can discard the used bag at this time. Filter Bag Part #: 3295-170