Click on the 'Settings' menu then 'Company settings'
Then, enter your company information:
Make sure to upload your logo, it will be displayed on your Invoices, Purchases Orders and other documents:
Enter your company default settings: Tax model, Number format...
Your PDF Settings will affect how your documents look once you generate a PDF. Go the menu 'Settings' > 'PDF Settings':
Select your Display settings:
You can also customize the name of your Documents: Estimates, Sales orders and Invoices. For example, you can rename 'Estimate' by 'Quote' if this more common for your business:
To learn more about erplain's Settings, including Taxes and Currency, go to Settings.