How do the Malaysians put in more money?

If they decided to put more money into the club, how do they go about it?

Would they have to buy more shares or can they literally say "here's X amount of money"?

Aty the moment they are making loans (which will have to be paid back at some point).

In the future there are £6-£8m of shares which haven't been issued which they could buy - this would take their shareholding over 50%