izin

/izin/

Cases

FormWhen to use it
nominativeizinthe permissionthe plain dictionary form — the doer of the sentence
genitiveizinnithe permission'sthe owner — whose it is
accusativeizinnithe permission (as the object)a specific, known object — whom or what
dativeizingeto the permissiondirection or recipient — to where, to whom
locativeizindeat / in the permissionwhere it is; also having — mende bar, "I have it"
ablativeizindenfrom the permissionwhere it comes from; also "than" when comparing
When to use each case
nominative
the plain dictionary form — the doer of the sentence
genitive
the owner — whose it is
accusative
a specific, known object — whom or what
dative
direction or recipient — to where, to whom
locative
where it is; also having — mende bar, "I have it"
ablative
where it comes from; also "than" when comparing

The endings are the same ones the pronouns wear — that page explains when each case is used.

With an owner

Owned
myizinimmy permission
youriziningyour permission
his / herizinihis / her permission
ourizinibizour permission
you all'sizinigizyou all's permission
theirizinleritheir permission

There is no plural of this word. The ending would attach like any other — it is the word, not the grammar, that refuses: this is not something Karachay counts.