FRONT-END
To change the powered by linkback from homepage 
please edit the file located : at ( themes -> default -> footer.php )
search the word PHPTRAVELS and you will get into line where all powered by code exist 
just update it with your business / brand name and also replace your logo icon with PHPTRAVELS logo 
That's all for front-end
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BACK-END
For backend admin login powered login page 
Follow these simple steps to complete your required action:

1. After when you have logged into your hosting cpanel, Go to 'File manager' 
2. Click 'application' option and find 'modules'
3. Access 'admin' after getting into 'modules'  
4. Edit 'Views'
5. Look for 'login.php' and edit this file
6. Find word 'Powered' 
   Here you can change or remove Powered by link 
7. Save changes to complete the action
   ( Application -> modules -> admin -> views/ -> login.php )

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NOTE : please be advised while removing powered by linkback to PHPTRAVELS will result to cancellation your support with us