I think you have gotten very good advice here. The reason you were not able to post is that the settings on the site “throttle” new users as a way of reducing “spam.” And while it works, it can be a hassle. Quickly, once you have over time read and posted and been on the site all those limits are gone. A spammer will come onto the site and immediately try to spam.
As to your questions. I am T2 and started insulin in 2010. I started with NPH and Regular. Your “Mix” is similar, it is Humalog protomine and Humalog. You generally start at a modest dose (as you did) and then increase the dosing until you see an effect. That would either be a lowering of your fasting blood sugars to a target range or a restoration of your after meal blood sugars at 2 hours to a target range. Unfortunately with a mix you can’t generally reach both fasting and after meal targets.
This is why I chose to start back in 2010 with separate doses of NPH and Regular. The disadvantage is that I had to use vials and syringes. And this will be a trade-off. You were likely started on the mix because it is available with a pen, you could do just 2 or 3 injections a day and it is simple. But it is just not capable of being finely tuned to what you will need. Eventually you will want an upgrade.
And I would echo what @David_dns has said. You should record your results over a couple of days and then make a change to dosing. And a conservative approach is to change by 5%, maybe 10% each time. It is important to understand that the insulin will have no effect until you reach what is called a physiological dose. Your external insulin is to a certain degree “offsetting” your remaining insulin and will only have a visible effect once you reach that physiological dose. Once you reach that dose you will likely see a clear lowering of your blood sugar. So don’t take big jumps in dosing because once you reach that point you do not want a bad hypo (low blood sugar). So I would encourage you to be conservative and check in with your educator and doctor regularly until you are stable.