theft at work money gone missing need good advice,who do i turn to now,,,a

[emma 30]

cover up or what? it was supposed to be missing on my shift,it was proved it cant of been ,the lady in question was on holiday,so it happened on another day,i noticed something not quite right about the till sheet the day before,i txt my manager this weekend and told her that if i looked at the till sheet and the float sheet it might jog my memory,the information on float sheet would be so important,when i went to check,the opening and closing till sheet,it wasnt my writing or my signature,i asked my manager about it,she said it was cause there was mistakes on the float sheet she re did it ,and got another member of staff to forge my signature,i asked were the original sheet was ,and tried to find it...i told her that was fraud,she said it wasnt,she then rang the member of staff and told the member of staff that she could be in big big trouble for forging my signature. i told her that when it gets investigated im gong to tell the truth ,and tell them about the forged document....what should i do now ,, i am completely in the clear 100%. what do i do next or do i just leave it cheers emma xxxxx