Where’s the plus pole on the battery?

Hello dear community, I have a question about the battery in a Kia Ceed Travel Emotion (see pictures). Sorry already for my ignorance. Wanted to bridge the battery with a starter cable from Herth & Buss as it no longer starts. Red cable to the plus pole etc…. However, where is the plus pole? (see pictures black circle) 😕 And can it be that one needs a finer, small terminal or the battery has to expand half to the plus pole to com men? Mine doesn’t lock, because the clamp is too coarse/large… Thought the starter cables would all be standardized. In addition, you might also tell me where to install the black cable (mass/metal point). Thank you very much for your support!!!! Best regards Albert