When you click post a reply there will be a couple of tabs below the dialogue box. Click upload attachments then follow the options. Note that max file size is 1mb so you may need to reduce the size of files. There is a thread in 'the menu' category that takes you through step by step. Here's the link to that post -
viewtopic.php?f=97&t=54. There's another thread covering ways to reduce files sizes if you need help with that.
Serissa: reasonably hardy. Just feed and water when needed and trim back long bits whenever they grow. Biggest job is to keep cutting off all the suckers that grow from the roots. Not sure what else to offer?