wrong mail adress on my account in the cell-fone

Dear Ladies and Gentleman

I wrote you from switzerland.

In my account by seeking alpha in the cell-fone is written e wrong mail adress

insted of poestler@gmx.net is written poestler@gmx.ner.

This means i can't write some messages becouse i have to confirme the link.

I dont know how to change it.

Please help me how i can change it.

Greatings