You are not screwed, although you will need a Philips head screwdriver.
That's a BUS wire connector. It is probably very snugly fit into the port but it can be pulled out. This type of connector makes wiring for custom installers simpler/cleaner. It's will within the realm of compatibility. The markings on top of the connector indicate red for positive and black for negative as well as W for woofer and T for tweeter. Essentially the speaker is much like any other bi-wire capable speaker, only difference is the connector type. After you pull the BUS connector from the speaker you can use a screwdriver to loosen the screwhead and insert wiring. I'd recommend making short "jumper" wires (about 2-3" in length) to connect the woofer and tweeter together. I would take the wire coming from the receiver and wire it into the W side (positive and negative) and then run your jumper from the W to the T and make sure that your red goes to the other red and the black to the other black.
If you don't understand any part of this please ask before guessing, you don't want to risk damaging your amplifier/receiver by doing this incorrectly.
