I am giving a command but nothing is happening?
Space Haven works on a principle of priorities, meaning crew members will carry out tasks in a swift way but might have many tasks to take care of. If you order something to be constructed (or something to be dismantled) the facility will be marked, which means a crew member will eventually come and carry out the task. Don’t expect something to happen instantly, rather a character has to walk to the position and perform the task.
Which crew member will come is based on the priorities system, which can be adjusted in the crew management menu. If no crew member has at least a low priority for the corresponding task then nobody will carry it out. This is not something that needs to be modified right away, the starting crew has priorities set in a way where all normal jobs will be carried out eventually.
Furthermore, crew members have their own schedules with work (Cog symbol), leisure time (Coffee symbol) and sleep (Half moon symbol). Work related tasks (Like construction) will be carried out on work schedule. See schedule menu for information on adjusting crew schedules.
DO NOT LEAVE CREW MEMBERS DRAFTED. Drafting means to “take manual control” effectively stopping them from doing any normal job. Only draft when you want to equip crew members with weapons and when in combat and other special situations.