Here are the steps:
Step 1
Firstly, we are going to create a new SharePoint app by using Napa development tool.
Step 2
Firstly, we are going to create a new SharePoint app by using Napa development tool.
Step 2
It describes how to change site icon/logo in SharePoint app using NAPA development tools in Office 365 site.
The following are the steps to create a new app and add the desired script to perform the operation.

- Go to office 365 site Home page. Click on Sites settings gear icon and click Site contents.
- In Site Contents page select “Napa” Office 365 Development Tools. Here we are using Napa tools to develop SharePoint app. Before that you have to add a Napa Office 365 Development Tools app in your site to create a new app. Click on add an app.

- New search window opens to display matching your apps on SharePoint Store. Click on 1 result in the SharePoint Store.

- It redirects to the SharePoint app Store displaying app that is matching with your search criteria. Click Napa office 365 Development Tools to add into our site.

- If you already added this app into your SharePoint site, it displays the message, otherwise click ADD IT button. It gets added into our SharePoint site:

- This way we added Napa tool app into our existing site.

- Click on Napa tool to create a new and click Add New Project.

- There are certain types of app type listed to build. Select App for SharePoint and enter Project name and click Create button.

- Tool contains left navigation that shows content, images, pages and scripts where we can add images, javascript files and apply reference into the default page. Default page show added css, js file reference in the following figure:

- HTML content need to be placed in Main content placeholder.

- To build the new app click “Run Project”. App contains default App.js and default.aspx page script which display the current user name into newly created app. Go to Site Home page and click on newly created app. The following figure displays the current username
.
This way we can create a new SharePoint app using Napa development office 365 tools.

Baimey RajeshPosted Sep 13, 2015, 8:05 AM
Hi Sumit, Good to read on this. My comapny have a requirement for sharepoint with office 365 but have queries related to this. The client insist on Office 365 , but some articles say that the support for office 365 will not be provided for public websites. Please lemme know any comments on the same thanks
Karthikeyan KPosted Sep 12, 2015, 6:26 AM
Good one sir...Thanks for sharing
Santhakumar MunuswamyPosted Sep 12, 2015, 3:09 AM
Thanks for nice article:)
Mohammed IbrahimPosted Sep 12, 2015, 1:52 AM
nice information
Shubham KumarPosted Sep 12, 2015, 1:39 AM
Good sir
Pankaj Kumar ChoudharyPosted Sep 11, 2015, 1:19 PM
Nice Explain Sir...........
RakeshPosted Sep 11, 2015, 10:23 AM
Good one sir
Nilesh JadavPosted Sep 11, 2015, 9:22 AM
Great Post
Rajeesh MenothPosted Sep 11, 2015, 8:55 AM
Nice One
Harshad PansuriyaPosted Sep 11, 2015, 8:28 AM
Nice One