Hard to find kanjis for "custom reviews"

Hi!

I'm studying kanjis with Jalup Kanji Kingdom and i have a hard time to find some kanjis.
I'm quite sure ringotan has those kanjis in the app but i don't know how to add them to my "custom study" list. Here are some troublesome ones:

仇
弛
庇
屁
汲

Best,
Jacques

PS: Would it be possible to search a Kanji directly (by typing it) instead of looking it up in a list?
While looking at other topics, i've seen that "Search (or "add using keyboard") in custom reviews" has been created though...
PS-2: Would it be possibe to create our own list of kanjis in text file (or from a string of kanjis) and to import them directly into ringotan ? That would be great... Right now, i'm just adding kanjis one by one from Jalup Kanji Kingdom to my Ringotan kanji "custom review" and it's not very effective...