yes
To change your theme on tumblr, you can try going to settings and then clicking customize my blog, or you can try going to different blogs, selecting which one you like and then pressing install.
It's easy to customize your blog's theme on the Tumblr app for Android. Just go to your blog page and click Edit at the top. From there you can change your theme and customize its colors and fonts
You can't change the font in your Tumblr post because it comes with theme itself. You would have to change your theme to get the different options with the fonts that you like.
things change. there are probably plugins for the old theme
You can't sorry :/ You can only do it from you computer.
Search around the theme garden. There should be one there. If not look around the web. There are lots of sites dedicated to tumblr themes.
After you click on the "Customize Appearance" link, the bar on the left should show either your selected theme or "custom theme." You should see an "Edit HTML" button next to it. Clicking on that will bring you to the HTML of your theme. You can change your background on the HTML. Or instead of going to the custom HTML, you can go under Appearance and you can either upload a picture for your background or change the colour of it.
You shouldn't steal Tumblr themes! :PP
Making a tumblr theme is not that easy. But there are sites that offers good quality themes, with affordable prices.
Google "perry the platypus tumblr theme".
it Really Depends on The Theme. it's Nothing Like Myspace. You can't Just Edit it . Unless You Know How To Change The HTML For The Theme.
Learn HTML.