Can't do that any more. Used to be able to do it by having an account at a commodities bank... like Lehmann Bros., Bear Stearns, MF Global or PFG Best... all gone now.
Now the commodities exchanges (COMEX, NYMEX, CME) have instituted a rule that they will not settle accounts with the metals... only more paper. It you keep up with the news, both COMEX and the various metals ETFs (other than Sprott) have had HUGE draw-downs in physical inventories, which were more than likely leased. Most gold and silver is heading to the Orient.
Basically, you go down to your local coin/bullion dealer with cash and pay spot + dealer premium. Premiums change from one product from another. You can generally get generic silver for $1.75 over spot, but US Mint eagles are $5 over spot. I got an Aussie gold round for only $50 over spot, versus $75 for US gold eagle.
If you buy under $1,000 worth at a time, expect to pay sales tax. You don't want to buy over $10,000 at a time because the dealer will have to report it to various alphabet agencies.
If you're gonna get some bullion, you'd better hurry up.
You can't unless you are a member of a bullion exchange.
You can take delivery on a futures contract.....
