Step1

1Go to Extensions -> Template Manager -> st_yourtemplate
2Go to Style
tab.
3Be sure that the Show logo
option is enabled.
4Choose the position on which you want to display the logo.
5Set this field on Custom
.
6Set this field on MediaManager
.
7Click on select button to upload and select your logo.
Step2

1Click on Choose Files
button to select and upload your logo.
2Click on Start Upload
button to upload your logo to Joomla.
Step3

1Select the logo that you've uploaded.
2Check that the logo is correctly selected.
3Click on Insert
button to insert the logo into your template.
Step4

1Check that the logo is correctly inserted.
2If everything is correct, please save your settings and you're done.
If everything was done correctly your logo should display in front-end, if not please re-check all steps.