How do I post business expenses on quickbooks which I paid for from my personal bank account.

I can help you post business expenses paid via your personal bank account, DawnInc. 

When you reimburse a personal expense, you can record it as a cheque or an expense. I also recommend reaching out to an accountant so they can advice what accounts will be affected. I'll show you how:

First, record the business expense you paid for with personal funds:

1. Select + New and then click Journal entry.
2. On the first line, select the expense account for the purchase.
3. On the second line, select Partner's equity or Owner's equity.
4. Select Save and close.

We can reimburse the expense via a Cheque or Expense: 

Cheque

1. Select + New. Then, click Cheque.
2. Choose and click a bank account to use to reimburse the personal funds.
3. In the CATEGORY column, select partner's equity or owner's equity.
4. Enter the amount to reimburse.
5. Select Save and close.

For Expense, still go to the +New button and click Expense. Enter the same details as I've provided when using cheques. 

You can refer to this article if you need more help with mixing business and personal finds. 

Let me know if there's anything else that you need help with. Take care!