First of all, open your inventory. Make sure a sim isn't using the item you want to move. Press on the item you want to move so that the bottom turns green, then drag it to your inventory.
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If you have a beetle or butterfly in your Sims inventory, simply drag it to a table, counter, etc and it will automatically be put in a tank.
To put furniture away you either go to the backpack on your Sims info and get the item and click it then the item that pops up on the inventory. You don't just need Sims 2 pets!!!
when you have the nectar in your inventory, just click and drag it into the rack.
Put the cursor on your sim and then a list will pop up, when it pops up, 'Look in inventory' will be there, click on it and there you go.(:
Put the guitar in your inventory, then go to a public place and play the guitar.