3.2.2
Thanks

1. How to change the default Activity page  with blog, or the wire page, when someone click the logo.

1, 2

2. How to add a logo image (on default latest version theme)

https://elgg.org/discussion/view/2820502/elgg-3-replace-logo-text-with-image

3. How to change the entire theme colors..

1, 2, 3, 4

4. How to insert some codes...

http://learn.elgg.org/en/3.x/guides/views.html#overriding-views

5. it's any chance in Blogs, to appear thumbnails?

https://elgg.org/plugins/782529

We're currently working on updating our apps for our platform and store.
We've already created some apps for Elgg 3 (including plugins, e.g. Google AdSense plugin) but they will be available in our store and platform during Q1.

However, you can try our demo app with one of our themes now.
There you can see all the features you requested.

If you are interested then I can send you the demo site credentials.

cool. thanks a lot.

please sent me the demo credentials.