OK, great.
Your knitting looks lovely. I like the colour too.
You are doing 1 x 1 rib, that’s the k1 p1 repeated across.
Now you are on the transition row between the rib at the waist band and the main body of the sweater. The stitch count changes here which is why there are some increases distributed across the rib row.
The idea is to maintain the rib pattern you have been doing even though it will be interrupted by the increased stitches.
For each “rib” whether it is rib 2, rib 12, rib 1 or any number you need to look at the next stitch to be worked in the left needle.
If that stitch you are about to work is a knit stitch, which looks like a V and creates a column of Vs, then to rib this means to knit it.
If that stitch you are about to work is a purl stitch, which looks like a bump or a line across the stitch and creates the column of bumps which is a bit set back from the column of knits, then to rib this means to purl it.
So, for each rib stitch look at the fabric, knit into the stitches which were previously knit, purl into the stitches which were previously purled.
As you you are adding stitches to the row the columns you produce on the right needle will be a little disrupted, some will look like normal columns like they did before, some will look a little off due to the new stitches being added. This is fine and will not be noticable in the final sweater as you are about to change to the cable patterning anyway.
Just looking at your photo, the next stitch on the left needle will be a purl stitch.
I hope this helps. If you are still stuck let us know.
This is a very complex sweater pattern and will be an amazing achievement.