If you are looking for signature like above, follow these steps:
1. You have to make letter head with your 2 logos and company details and we'll use that letter head in invoice. You can use Paint application to design your letter head or get it done from any graphic designer. It should be either in .JPG or .PNG format and size similar to A4 sheet or where you want to print your invoice.
2. Findout where is your letterhead, locate it, right click on it > Properties and note down its path as shown here.
Here the path is: c:\users\rohit\desktop\folder
and image name is: letterhead.jpg
2. a. Go to Settings > Template Settings > Disable Company Header and Disable Company Logo
b. In Invoice Heading column, type as following:
<img src="c:\users\rohit\desktop\folder\letterhead.jpg"><br>Tax Invoice
Kindly note, this img src, you need to type as it is and the path will be your computer path where your letterhead file is located and in the last Instead of Tax Invoice, you can type whatever heading you want to keep for Invoice Heading like Sales Invoice, Tax Invoice or Just Invoice.
If you are using Book Keeper on multiple Systems and keep letterhead.jpg file in My Document in all systems and in invoice heading, just write file name in img src tag, no need to give path.
Example: <img src="letterhead.jpg"><br>Tax Invoice
Save these settings and now view your invoice. It will show you on letter head and with proper details and 2 logos.
Here is the sample invoice how it looks: