New Shimano 11 speed road chain problem I just bought a new 11 speed Shimano chain online. The wide end of the chain had a flat pin half sticking in, I tried to use a chain tool to release it a bit allowing for more room to connect the other end of the chain. Instead I accidentally removed it completely. 

Now I can't get it back in like the other chain connectors. Do I need a Shimano chain Connector or is there another way to do it?

Can I just get some of the left over chain and add it to the other end getting rid of the part with the pin I knocked out or is it required?

Thanks
All Shimano chains I've fitted recently have come with a special connecting pin in the box, rather than a pre-fitted flat pin.

This dealers' manual for Shimano 11 speed chains only describes use of the bullet-shaped connecting pins: https://si.shimano.com/pdfs/dm/DM-CN0001-02-A-ENG.pdf

You can buy packs of 3 or more. Fit one then to avoid long walks, keep the others in your wallet or in your puncture repair kit.