ok, the issue we are facing here, is you keep jumping between different topics, and connecting different things,
you really need to focus on one thing at a time, as your at risk of confusing us all
but lets take each thing your talking about, one by one
a) send (midi) data from the Organelle to the computer/ableton.
to do this you need to connect the midi interface to your computer, and then the emu midi cable usb into the organelle, then the DIN into the midi interface - viola, midi can now go from organelle to your computer and back
b) connecting your keyboard to the Organelle or Computer.
this is different, because your keyboard (akai mpk mini) has only USB midi, so you just use the USB cable that was supplied with it,
the cable will look something like:
(you can get in any electrical/computer shop if you have lost it)
c) audio in to organelle
ok, so the video you linked, does not just midi at all, so there are no midi cables involved, this video just takes audio from the iPhone and process it in the organelle
an iphone uses a 3.5mm stereo jack output, and the Organelle has a single stereo 1/4" (6.3mm) stereo jack, so you need a cable to run between the two , and likely an adapter (depending what you cable looks like)
if you have a line/headphone out on your computer you can do the same to send audio from your computer to organelle.
(if you have an audio interface , see below)
d) audio out of organelle into ableton
this all depends what you have to get audio into your computer.
if you have a 3.5mm line in on the computer:
then you can use this, and you’ll need to get a 1/4" ‘Y cable’ which takes the two mono 1/4" jacks on the Organelle and puts into a single stereo jack, then you’ll need a lead , and possible an adapter like the input.
if you bought the UCA202 audio interface as you mentioned before, then you can use this to send audio between your computer and organelle (both ways)
then this appears to have RCA connectors (this is a bit unusual, most use 1/4" jacks like the organelle)
so you will need two cables with 1/4" mono at one end, and RCA connector at the other end.
(you’ll need one for input, and one for output)
ok, so all the above should enable you to get your computer to send/recieve midi to the organelle, and to send audio from your phone to organelle, and also send audio between your computer and organelle.
given this appears to be new to you, id suggest you try each in turn, and try to get one thing working at a time.
also Id suggest watching a few youtube videos on topics like how to link keyboards, and computers, and send audio into computers etc… Im sure ableton have some.
what you learn about connecting your computer to your keyboard/audio interface, will then directly transfer on how to do it with the organelle which is basically the same.
EDIT: also @healthylives link to the organelle manual has some great pictures, to explain whats going on