We are sorry for inconvenience. The next version will be much more friendly for the ones like you who would want to upload their own header.
In the meanwhile, here is the list of some templates that should support header upload:
aa-03, aa-05, aa-08, aa-10, aa-11
agriculture-001
al-02
art_and_photography-001
as-02, as-03, as-04, as-06, as-07
av-074, av-137, av-139, av-140, av-141, av-171, av-195, av-198, av-206
av-214, av-246, av-258, av-262
beauty-003
business-001, business-009, business-011, business-013, business-017
business-019, business-021, business-022, business-023, business-024
business-026, business-027, business-030, business-033, business-035
cafe_and_restaurant-002, cafe_and_restaurant-004, cafe_and_restaurant-005
chr-01, chr-02, chr-03, chr-04, chr-05, chr-06, chr-07, chr-08, chr-10
chr-11, chr-12, chr-13, chr-14, chr-15, chr-17, chr-21, chr-23, chr-24
chr-25
electronics-001
eug-01, eug-09, eug-11, eug-12, eug-13, eug-14, eug-16, eug-18, eug-19
eug-27, eug-29, eug-31, eug-32, eug-33, eug-34, eug-35, eug-36, eug-38
eug-39, eug-40, eug-41, fashion-001, fashion-004, fashion-005,
fashion-006
food_and_drink-001, food_and_drink-002
food_and_drink-003, food_and_drink-004
industrial-001
interior_and_furniture-001, interior_and_furniture-002, interior_and_furniture-003
moto_car-002, moto_car-003
music-001, music-002
night_club-001, night_club-002, night_club-004
personal-003, personal-006, personal-007, personal-010, personal-013
personal-014, personal-015, personal-016, personal-019, personal-020
personal-021, personal-022, personal-023, personal-024, personal-025
personal-026, personal-027, personal-028, personal-029, personal-030
personal-031, personal-032, personal-033, personal-034, personal-036
personal-038, personal-039
real_estate-001
spec-01
sport-003
travel-001, travel-003
vap-02, vap-05, vap-07, vap-09, vap-10, vap-11, vap-12, vap-13, vap-15
vap-18, vap-21, vap-22, vap-26, vap-28, vap-30, vap-31, vap-33, vap-34
vap-35, vap-38, vap-40, vap-41, vap-43, vap-44, vap-45, vap-47, vap-48
vap-49, vap-51, vap-52, vap-53, vap-56, vap-58, vap-59, vap-62, xbs-04
xbs-11, xbs-14, xdim-01, xec-01, xet-05, xet-06, xet-10, xet-11,
xet-16, xet-17, xeug-01, xeug-02, xeug-03, xeug-04, xeug-06, xeug-07
xeug-08, xeug-15, xeug-17, xeug-18, xeug-20, xeug-21, xfil-02, xmp-02
xmp-04, xmp-05, xmp-06, xmp-10, xmp-11, xrot-03, xsk-01, xsk-02
xsk-05, xsk-08, xsk-09, xsk-10, xsk-11, xsk-13, xsk-14, xsk-16,
xsk-17, xsk-18, xsk-19, xsk-21, xww-04, xww-09, xww-10, xww-15
xww-16, xww-18, xww-20, xww-21, xww-22, xww-23, xww-24, xww-25
xww-30, xww-34, zeug-02, zeug-03, zeug-04, zeug-05, zeug-08,
zeug-09, zeug-11, zeug-13, zsk-01, zsk-03, zsk-05, zsk-07, zsk-16
zsk-17, zsk-18, zsk-19