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/give @p minecraft:sign 1 0 {BlockEntityTag:{Text1:"[{\"text\":\"\",\"clickEvent\":{\"action\":\"run_command\",\"value\":\"summon armor_stand ~ ~ ~ {NoBasePlate:1b,ShowArms:1b,ArmorItems:[{id:\\\"log\\\",Count:1b},{id:\\\"log\\\",Count:1b},{id:\\\"log\\\",Count:1b},{id:\\\"bedrock\\\",Count:1b}],HandItems:[{},{}],CustomName:\\\"Pedriao\\\",CustomNameVisible:1b,Pose:{Head:[0f,0f,29f],LeftLeg:[269f,0f,0f],RightLeg:[258f,0f,0f]}}\"}},{\"text\":\"summon \"},{\"text\":\"Armorstand\",\"color\":\"dark_blue\"}]"},display:{Name:Armorstand}} Command to modify an existing sign