The km_ojibwa choice is actually a package that installs six keyboards:
Ojibwa, left-dot i-final
Ojibwa, left-dot a-final
Ojibwa, left-dot western-final
Ojibwa, right-dot i-final
Ojibwa, right-dot a-final
Ojibwa, right-dot western-final
It seems you are using the “Ojibwa, left-dot a-final” keyboard.
We do not have the source files or documentation for these keyboards, but perhaps you can find what you need on the author’s website: http://www.languagegeek.com
Starting from that page, and clicking Keyboards, then “Anishinaabemowin (Ojibwa)” (under “SYLLABICS ORTHOGRAPHY”) takes you to:
http://www.languagegeek.com/algon/syllabics_keyboards/cr_oj_oc_na.html
On that page, under the OJIBWE heading, you can download a PDF file for “a-finals, left-side w-dot”:
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