I've imported into electrum as instructed and I see my change. Thanks for that.
Tommorow i'll have few more bucks in my account but it would appear in my legacy address, but maybe i can reroute that.

Bear with me for last question. Given that i have this change, how to create another tx that will bump my previous tx? Don't mind the amounts im spending, that it'll be too low. I want to know how to do it.