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how do I open hammer

Hello, I want to be leader, my steam ID is STEAM_0:0:504301957 I am consistently a leader in TF2 ZE, also an trusted person by one of your admins, GBGaming List: ze_pkmn_adventure ze_pokemon_adventure ze_potc ze_wuhan ze_squid_game ze_santassination ze_minecraft_adventure ze_minecraft_universe ze_biohazard ze_bathroom ze_krusty_krab ze_surf_vortex ze_voodoo_islands ze_subway_escape ze_rocket ze_shroomforest1 ze_shroomforest2