Open your photo & make a duplicate layer of it.
Go to the top menu & select Layer-new adjustment layer- and from the submenu select 'Photo Filter' & click OK -from the next dialogue click on the 'Warming Filter 85' hold down the mouse on this & you will see near the bottom of this sub menu "SEPIA".....Hold on, not finished yet! In the same dialogue -click on the 'color' dot and move the slider to about 70% and decide whether to 'untick' the 'preserve luminosity' by looking at your picture! Now, I think you are probably thinking as I did....-still doesn't look sepia to me! -SO next we go back to the top menu for -Layer-New Adjustment layer select Hue & Saturation...click OK and then in the dialogue box there are three sliders.....you only need to move the centre one which is 'Saturation' -move this to the left whilst looking at your picture and decide when to stop at the level of SEPIA which is to your taste....JOB DONE? All that needs done now is to 'Flatten Image' which is done by clicking the tiny 'more' button on the top right of your layers palette & select 'flatten image' OK -Save & Print